Play Nintendo NES Games On Your iPod
Did you know that you can play Nintendo NES games on your iPod? iNES is a port of another NES emulator called InfoNES to the iPod to allow *legal* NES ROMS to be played on the iPod. Currently there are about 6 games that work with it in fullscreen mode. The 5.5G video iPod, 5G video iPod, iPod photo, and the 1G iPod nano all work with iNES, but it’s a little sketchy on the older iPod photo models. iNES uses iPodLinux so it’s a little bit of a hack and probably not for novices.
For more information on iNES you can view their Wiki page.

Thursday 12 Apr 2007 | ipods | iPod Nano, iPod 5G (Video)

Yeah, but it is a lot harder to get onto an ipod. I use iBoy on my ipod photo. Heck of a lot easier to install on it. iPodlinux is great, if you dont have it get it.
iNES is a bit out already, take a look at iDarcnes, it can emulate almost ALL .nes roms with playable speed (~100%) and sketchy sound. It works on iPod nano and video. It’s great!
http://ipodlinux.org/forums/viewtopic.php?t=18245
http://ipodlinux.org/IDarcnes